Die-stock.



F. W. WHELPLEY.

DIE STOCK.

APPLICATION FILED JUNE 26. 1915.

5 1 9 1 "hm 2 ow 0 M m LAIJV COLUMBIA PLANOGRA'PH C0.. WASHINGTON. D c.

FREDERICKJ-W; WHELPLEY, 0F GREENFIELD, MASSACHUSETTS.

DIE-STOCK.

Specification of Letters Patent.

Patentedflct. 2e, 1%15.

Application filed June 26, 1915. SeriaI No.36,459.

To all whom it may concern.

Be it known that I, FREDER CK W. WHELP- LEY, a citizen of theUnited States, residing at Greenfield, in the county of Franklin and State of Massachusetts, have inventeda new and useful Die-Stock, of whichthe following is a specification.

The present invention appertains to die stocks, and aims to providea die stockof novel and improved construction whereby the utility and efficiency thereofis enhanced.

The object of the invention is the provision of a die stock having unique means whereby the dies or chasers may be retracted after the screw thread'has been formed, so that the die stock may be readily removed from the pipe or other object without the necessity of unscrewing the stockfrom the pipe, the present device also being oper able for adjusting the position of-the dies or chasers when they are in operative position;

It is also within the scope of the invention to provide a die stock ha-ving the features above noted, and which at thesame time, is comparatively simple, compact, nonencumbering and ineXpensi-vein construe tion, as well as being convenient, practical and etlicient in use.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment. of the invention herein disclosed can be made with in the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a side elevation of the improved die stock, portions of the handles.

being broken away. Fig.2 is an edge view thereof; Fig. 3 1s a longtludina'l section taken on the line 3-3 of Fig.1.f Fig. :41 is a side view looking in the opposite direction than in Fig. 1, portions beingbroken'away and shown in section. Fig.5 is a perspective view of one of the dies or chasers. Fig. 6 is a sectional detail taken on the line -6 6 of Fig. 4.

In carrying out the invention, the stock proper embodies a ring or annulus 1 having the diametrically opposite outstanding .sockets 2 Welded thereto and:= th1'"eadedly'receiving the handlesB whereby the handles" may be employed for forcibly rotating the stock. All annular member 4: is fitted snugly within the ring Lthe ring 1 having an inturned annular flange 5 at one edge to act as a stop for holding the member 1 within the ring 1. The member 4 is held within the ring 1 by the I engagement therewith of the pointed ends of the handles 8. The member 4 has a central aperture or bore 6, andis provided witha plurality of radial channels or slots '2' in which the dies or chasers 8 are slidable radially. The channels 7 extend to that side.

of the member 1 remote from the flange 4, and the dies 8 are held within the channels 7 by a flat ring or annular plate 9 secured within a depression "10 provided in the respective side of the member 4.-. The ring or plate 9 is held within the depression 10 by means of screws or other securing elements 1.1 engaged through the ring Q and'taking into the member 4-.

That side of the member 1 opposite the ring 9 and adjacent the flange 5 is provided with an annular channel or groove 12 in which a cam ring 13 is mounted for rotation. This cam ring 13 is provided with a plurality of spiral cam ribs 1 1 projectin from one side and working in notches 15 provided inthe dies 8, whereby when the ring 13 is oscillated, the dies 8 will be reciprocated radially. The cam ring 13 is provided with a radially projecting arm 16 projecting through and working in arcuate slots 1 and 18 provided in the member and ring 1 and registering with one another. When the arm 16 is moved to one end of the slots 17 and'18, the cam ribs 14: are moved between the dies and are disengaged from the dies, whereby the dies are released, so that they can be withdrawn through the slots or apertures 7 provided in the ring 1. The slots 7 a register with the channels 7 to allow the dies to be moved throughthe slots 7 The stock carries a guide, and to this end, an apertured disk 19 is disposed -be-.

tween the member 4 and flange 5 and has an outer depression or rabbet 2O surrounding its central aperture, and a retaining ring 21 is secured by means of screws or other securing elements 22 to the disk 19 so that its inner edge overhangs the depression or rabbet 20. The annular guide- 23 is provided with an outturned annular flange 24 adapted to be receivedv by the depression 20 behind the retainingring 21.- The retaining ring 21 is provided with a plurality of inwardly guide.

.side flangesv of the lever projecting lugs 25, and the flange 24 of the guide is provided with a corresponding number of notches 26, whereby when the guide is turned to a proper position, the guide may be applied to or removed from the stock since the lugs 25 can pass through the notches 26. When the flange 24 is moved into the depres sion 20 and the guide is then turned, the flange 24 of the guide will swing under the lugs 25 to hold the guide in position.

As a means for normally latching the guide 23 in position, a radially slidable latch 27 is carried by the disk 19 and is held in place by the ring21, and a coiled wire expansion spring 28 is carried by the outer end of the latch 27 and bears against the ring 1 to project the latch 27 inwardly into a notch 28 provided in the flange 24 of the The latch 27 has an outstanding finger piece 29 whereby the latch may be retracted by the finger of the operator when it is desired to release the guide 23.

The cardinal feature of the invention residesin the provision of means for swinging the cam ring 13 for retracting the dies after the thread has been cut, and for adjusting the active positions of the dies to a limited extent. This device will be taken up presently. A collar 30 is secured upon one socket 2 and is provided radially projecting ears 31, and a threaded stem or screw 32 is provided with an eye 33 pivoted between the ears 31 by means of a pivot bolt or element 34. A lever 35 of Ushaped' cross section has one end straddling and pivoted to the free end of the arm 16 by means of aremovable pivot pin 36, and the free end of the lever 35 is formed into a curved finger piece 37. A screw or threaded stem 38 is provided with an eye 39 at one end pivoted within the lever 35 between the ends'of the lever, and a pivot bolt or element 40 is engaged through the 35 and passes through the eye 39 to pivot the screw 38 to the lever. A leaf spring 41 is engaged to the bolt or element, 40 between the head thereof and the lever 35 and the free end of the spring 41 bears against the head of the pivot pin 36 to normally holdthe said pivot pin in place, so that the spring 41 may be swung away from the pin 36 to allow the said pin to be readily withdrawn. A turn buckle 42 in the form of a sleeve, is threaded upon the screws 32 and 38, the screws having right and left hand threads whereby when the turn buckle is rotated, the screws will be moved toward or away from one another. A binding nut 43 is threaded upon the screw 32 to bear against one end of the turn buckle 42 when the turn buckle is rotated to the desired position, so that the turn buckle is not liable to rotate accidentally.

The lever 35 provides one link of a pair of toggle links, and the screws 32 and 38 with a pair of cam ribs from the dies.

with the turn buckle 42 provide the other link thereof, whereby when the finger piece 37 of the lever is swung against the turn buckle 42, the toggle links will be straightened out to hold the cam ring 13 in position with the lever covering the link having the turn-buckle. By swinging the lever 35, the cam ring 13 will be rotated for moving the dies or chasers 8 correspondingly, and this enables the dies to be readily retracted after the thread has been out, while the turn buckle 42 enables a limited adjustment to be had.

The use of die stocks is well known, and a lengthy description of the use of the present die stock is therefore unnecessary, since it is used in practically the ordinary manner for chasing a thread upon a pipe or similar ob ject. lVhen the stock is in use, the lever 35 is swung against the turn buckle 42 whereby the toggle links may be straightened out to serve as a prop between the arm 16 of the cam ring and the collar 30, so that the cam ring will be prevented from rotating due to the outward pressure of the dies. The guide 23 is rotatable upon the pipe to properly guide the dies or chasers thereon. When the thread has been cut, the stock may be readily removed without the necessity of unscrewing the stock, this being accomplished by swinging the lever 35 outwardly whereupon the cam ring 13 will be rotated properly for retracting the (lies. The dies being retracted will enable the stock to be readily slipped off of the pipe. lVhen the lever 35 is swung back against the turn buckle 42, the device will again be in condition for use without any readjustments being necessary. By rotating the turn buckle 42 when the nut 43 is loosened, the length of the respective toggle link will be increased or decreased, which will vary the normal position of the cam ring 13, when the lever 35 is swung against the turn buckle, so that the dies will be held at a corresponding active position. The normal position of the dies may thus be adjusted within certain limits.

Ordinarily, when the parts are assembled, the lever 35 in striking the screw 38 when the lever is swung away from the turn buckle 42, will prevent the arm 16 from moving sufliciently in the slots 17 and 18 to disengage the eam ribs 14 from the dies, but

when it is desired to remove the dies for IT.

purpose of replacing or substituting them, the lever 35 and arm 16 are detached. This is quickly accomplished by swinging the spring 41 away from the pin 36, then removing the said pin, so that the lever 35 may be swung out of the way to allow the arm 16 to be swung sufliciently for disengaging the The dies may then be withdrawn through the slots 7*, and when the dies are replaced properly, the cam ring may be rotated to cause the cam ribs to enter the notches 15 of the dies. In this event, the lever 35 is again attached .to the arm 16. "When the lever 35 is swung against the turn buckle 42, it receives the screw 38 and the respective end of the turn buckle, to provide a compact and neat arrangement, and which allows the lever 35 to aline with the screws 32 and 38 and turn buckle 4L2. It is preferable to secure a fiat spring 4:4 Within the bend of the lever 85 to bear against the eye 39, thereby, to create friction between said eye and the lever, so that the lever 35 is not liable to swing accidentally away from the turn buckle 42 during the use of the die stock.

The guide 23 may be readily removed and replaced, as will be apparent from the foregoing, this being essential when the different sets of dies are employed for cutting a thread of different diameter.

The ring 1, with its sockets 2 and member 4: provide the frame of the stock which can ries the working parts in a practical and efficient manner.

Having thus described the invention, what is claimed as new is:

1. In a die stock, aframe, a radially movable die carried thereby, a rotatable cam ring carried by the frame and cooperable with said die for moving the same and having a radially projecting arm, a lever of U-shaped cross section having one end pivoted to said arm, and a link pivoted at one end to the frame and having its other end pivoted within said lever between the ends thereof, said lever being adapted to rest against and cover said link when the link and lever are straightened out 2. In a die stock, a frame, a radially movable die carried thereby, a rotatable cam ring carried by the frame and cooperable with said die for moving the same, said ring having an outstanding arm, a lever pivoted to said arm, screws pivoted to the lever and frame, and a turn buckle threaded upon said screws.

8. In a die stock, a. frame, a radially movable die carried thereby, a rotatable cam ring carried by the frame and cooperable with the die for moving the same, the said ring having an outstanding arm, a lever of U-shapcd cross section and having one end pivoted to said arm, a screw pivoted within the lever between the ends thereof, a second screw pivoted to the frame, and a turn buckle threadedly engaging said screws.

4. In a die stock, a. frame, a radially movable die carried thereby, arotatable cam ring carried thereby and cooperable with said die for moving the same, said ring being adapted to release said die when the ring is moved to a predetermined position, the ring having an outstanding arm, a lever, a removable pin pivoting the lever and said arm together, a link connecting the lever and frame, and a spring carried by the lever and normally holding the said pin in position and adapted to be moved for releasing said pin.

5. In a die stock, an annulus having an inturned flange at one edge, an annular member fitting within the annulus and having a plurality of radial channels extending to that side remote from said flange, an apertured disk between said member and flange, dies slidable in said channels and having notches, a ring secured to the annulus and holding the dies in said channels, the annulus having openings registering with said channels, said member having an annular channel in its opposite side, a cam ring rotatable in said annular channel and having spiral cam ribs projecting from one side and working in the notches of the dies, said member and annulus having registering slots and the cam ring having an arm projecting through said slots.

6. In a die stock, an apertured disk having a rabbet surrounding the aperture, a ring secured to said disk and having inwardly projecting lugs, an annular guide having an outturned annular flange fitting in said rabbet and provided with notches for the passage of said lugs, and a spring pressed latch carried by said disk and engageable with said flange to prevent the rotation of said guide.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

FREDERICK W. WHELPLEY.

Witnesses:

SIDNEY C. BARNES, SoFUs CHRISTIANSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

